如何使用SMOTE将合成数据集保存在CSV文件中 [英] How to save synthetic dataset in CSV file using SMOTE

问题描述

我正在使用信用卡数据通过SMOTE进行过采样.我正在使用在geeksforgeeks.org

先谢谢了.

解决方案

从您的代码中可以看到，您的 X_train_res 和其他代码都是Python Numpy数组.您可以执行以下操作:

 将numpy导入为np将熊猫作为pd导入y_train_res = y_train_res.reshape(-1，1)#将y_train重塑为(398038,1)data_res = np.concatenate((X_train_res，y_train_res)，轴= 1)data.savetxt('sample_smote.csv'，data_res，delimiter =，") 

无法运行并检查它，但是如果您遇到任何问题，请告诉我.

注意:您将需要做更多的事情才能为其添加列标签.一旦您完成此过程并需要帮助，请告诉我.

I am using Credit card data for oversampling using SMOTE. I am using the code written in geeksforgeeks.org (Link)

After running the following code, it states something like that:

print("Before OverSampling, counts of label '1': {}".format(sum(y_train == 1))) 
print("Before OverSampling, counts of label '0': {} \n".format(sum(y_train == 0))) 

# import SMOTE module from imblearn library 
# pip install imblearn (if you don't have imblearn in your system) 
from imblearn.over_sampling import SMOTE 
sm = SMOTE(random_state = 2) 
X_train_res, y_train_res = sm.fit_sample(X_train, y_train.ravel()) 

print('After OverSampling, the shape of train_X: {}'.format(X_train_res.shape)) 
print('After OverSampling, the shape of train_y: {} \n'.format(y_train_res.shape)) 

print("After OverSampling, counts of label '1': {}".format(sum(y_train_res == 1))) 
print("After OverSampling, counts of label '0': {}".format(sum(y_train_res == 0))) 

Output:

Before OverSampling, counts of label '1': 345
Before OverSampling, counts of label '0': 199019 

After OverSampling, the shape of train_X: (398038, 29)
After OverSampling, the shape of train_y: (398038,) 

After OverSampling, counts of label '1': 199019
After OverSampling, counts of label '0': 199019

As I am totally new in this area. I cant understand how to show these data in CSV format. I will be very glad if anyone help me regarding this issue.

Or if there is any reference from where I can make synthetic data from a dataset using SMOTE and save the updated dataset in a CSV file, please mention it.

Something like following image:

Thanks in advance.

解决方案

From what I can see from you code, your X_train_res and others are Python Numpy arrays. You can do something like this:

import numpy as np
import pandas as pd

y_train_res = y_train_res.reshape(-1, 1) # reshaping y_train to (398038,1)
data_res = np.concatenate((X_train_res, y_train_res), axis = 1)
data.savetxt('sample_smote.csv', data_res, delimiter=",")

Cannot run and check it, but let me know if you face any issues.

Note: You will have to do something more to add column labels to it. Let me know once you are through this and need help for that.

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